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Normal and Defective Colour Vision$
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John D. Mollon, Joel Pokorny, and Ken Knoblauch

Print publication date: 2003

Print ISBN-13: 9780198525301

Published to Oxford Scholarship Online: April 2010

DOI: 10.1093/acprof:oso/9780198525301.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 20 October 2021

The Effect of Global Contrast Distribution on Colour Appearance

The Effect of Global Contrast Distribution on Colour Appearance

(p.239) Chapter 25 The Effect of Global Contrast Distribution on Colour Appearance
Normal and Defective Colour Vision

K. Wolf

A.C. Hurlbert

Oxford University Press

This chapter tests the hypothesis that increasing the number of distinct surfaces that change consistently with the local background causes stronger reinforcement of the illuminant colour signalled by the background change, using the temporal-change paradigm. It also tests whether segmenting the remote surfaces from the local background by increasing the luminance contrast against it, and thereby weakening the evidence that they belong to the same illuminant, attenuates the contrast enhancement effect. The final experiment probes the locus of the ‘contrast enhancement’ effect by presenting the remote inducers and the target surface to different eyes using haploscopic viewing. The results provide inconclusive support for the notion that contrast enhancement by remote inducers is linked to estimation of the illuminant colour in a constancy mechanism.

Keywords:   background change, luminance contrast, contrast enhancement, haploscopic viewing

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